From: | "Rajesh Kumar Mallah(dot)" <mallah(at)trade-india(dot)com> |
---|---|
To: | "Christopher Kings-Lynne" <chriskl(at)familyhealth(dot)com(dot)au>, <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: Is Dropping a column "CHECK" constraint possible? |
Date: | 2002-07-07 13:45:10 |
Message-ID: | 200207071915.10489.mallah@trade-india.com |
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Lists: | pgsql-sql |
Hi ,
i want to enforce that a coulumn 'imp'
shud either contain valid data or no data at all.
by valid data i mean data having at least one non whitespace character.
will this constraint be approprote for accomplishing it?
tradein_client=> ALTER TABLE t_a ADD CHECK ( length( btrim(imp) ) > 1 or imp is NULL );
regards
mallah.
On Saturday 06 July 2002 10:05, Christopher Kings-Lynne wrote:
> > can anyone please help?
> > i have a to drop a check contstraint from a column. eg
> >
> > tradein_clients=# \d t_a
> > Table "t_a"
> > Column | Type | Modifiers
> > ------------+---------+-----------
> > company_id | integer |
> > exp | text |
> > imp | text |
> > Check constraints: "$1" (length(imp) > 1)
> > "aaaaaq" (length(imp) > 1)
> >
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